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Not many people use those, Ving, so I imagine there aren't many on the market.
I have been eyeing the same type of equipment. I am keen to start measuring double separations and secondary position angles. Is that what you have in mind as well?
It might be worth your while emailing Richard Jaworski, who heads up the double star committee of the NSW Astro Soc. He might know which one is best to get, and maybe even know of or have an old one to sell to you????
I know Bintel have the item you have mentioned, new. It is pretty pricey though.
Celestron also have one, which Ausastronomer says is better. I am not sure why.
Let me know how you get on.
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